Abstract

We report the observation of room temperature ferromagnetism in Cu-doped (5%) ZnOfilms grown on -plane sapphire substrates. Films were prepared by pulsed laser deposition technique and were thoroughly characterized using several state-of-the-art characterization techniques. Hall measurements showed that the films are of -type with a carrier concentration of . Magnetization measurements showed that the films exhibit room temperature ferromagnetism with a saturation magnetization of atom. When additional carriers were introduced in the films,ferromagnetism was completely vanished. Our results show that the -type nature of the film is not essential for realizing ferromagnetic characteristics; however, the concentration of -type carriers should not exceed a critical value.